UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 7, 2013

GLOBE SPECIALTY METALS, INC.

(Exact name of registrant as specified in its charter)

One Penn Plaza, 250 West 34th Street, Suite 4125

New York, New York 10119

 (Address of principal executive offices and Zip Code)

(212) 798-8100

 (Registrant’s telephone number, including Area Code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01 Other Events.

On May 7, 2013, Globe Specialty Metals, Inc. stated during its earnings conference call that it is considering the possibility of pursuing a private offering of debt securities through a Rule 144A offering under the Securities Act of 1933. The net proceeds of such an offering would be used to refinance the company’s revolving credit facility and provide funds for general corporate purposes, including acquisitions. Any such offering would be subject to market and other conditions.

The debt securities would not be and have not been registered under the Securities Act or any state or other jurisdiction’s securities laws. Accordingly, the debt securities would not be offered or sold in the United States absent registration or an applicable exemption from registration requirements under the Securities Act and any applicable state or other jurisdiction’s securities laws.

This statement does not constitute an offer to sell or the solicitation of an offer to buy any securities nor shall there be any sale of any securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.